Role of Alveolar β2-Adrenergic Receptors on Lung Fluid Clearance and Exercise Ventilation in Healthy Humans
2013
Background
In experimental conditions alveolar fluid clearance is controlled by alveolar β2-adrenergic receptors. We hypothesized that if this occurs in humans, then non-selective β-blockers should reduce the membrane diffusing capacity (DM), an index of lung interstitial fluid homeostasis. Moreover, we wondered whether this effect is potentiated by saline solution infusion, an intervention expected to cause interstitial lung edema. Since fluid retention within the lungs might trigger excessive ventilation during exercise, we also hypothesized that after the β2-blockade ventilation increased in excess to CO2 output and this was further enhanced by interstitial edema.
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